Feed-table for grinding-machines.



J. MILLER, JR. FEED TABLE FOR GRINDING MACHINES. APPLICATION FILED MAY 7. 1907.

Patented Feb. 16, 1909 2 SHEETSSHEET l.

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Patented Feb. 16, 190%. 2 SHEETS-SHEET 2.

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il\ml UNITED STATES PATENT OFFICE.

JOHN MILLER, JR, OF BELOIT, WISCONSIN, ASSIGNOR TO CHARLES H. BESLY, CHICAGO,

I ILLINOIS.

FEED-TABLE FOR GRINDING-MACHINES.

Specification of Letters Patent.

Patented Feb. 16, 1909.

Application filed May 7, 1907. Serial No. 372,412.

1'0 all whom it may concern:

Be it known that 1, JOHN hilnLnR, Jr., a citizen of the United States, and a resident of Beloit, in the county of Rock and State of Visconsin, have invented certain new and useful Improvementsin Feed-Tables for Grinding-Machines; and I do hereby declare that the following is a full, clear, and exact description thereof, reference being had to the accompanying drawings, and to the letters .of reference marked thereon, which form a partof this specification.

This invention relates to improvements .in grinding or polishing machines, and more particularly to fiat surface grinding machines, or what are generally known as disk grinders, and more especially to a work-supporting table for use in connection with such machines.

The invention consists in the matters hereinafter set forth and more particularly pointed out in the appended claims.

My invention may be better understood by reference to the acconu'ianying thawiugs, in which,-

Figure 1 is a side view showing my improved work-table in place upon a. grinding machine. Fig. 2 is a vertical section on the line 2-2 of Fig. 1.. Fig. 3 is a plan view of the work-table. Fig. 4 is a horizontal see- I tion, on the line i-4 of Fig. 1. Fig. is a horizontal section, on the line fi -5 of F 1.

F ig; 6 is a view showing thegside opposite to the s1de shown in Fig. l. -l*1g. 7 is a perspectiveview of the table-top detached from its mountings. Fig. 8 is a perspective view of the base member of the workdablc. Fig.

9 is a perspective vicw'of the vertical arm on which ,is mounted said work-table.

As shown in said drawings. indicates the pedestal of a grinding machine provided with a head-stock A in which is journalcd a spindle or rotary arbor carrying the grinding disk A Below the disk A is rigidly fixed a cylindrical shaft (1 which extends outwardly from the pedestal parallel to the said rotary arbor. Upon said shaft a is mounted a hub B carrying an upright arm Z)- upon the upper end of which is mounted the work-t-able C. Said hub B is adapted to be either turned upon said shaft, permitting the table to oscillate in a plane parallel to the face t the grinding disk, or to be clamped or secured to the shaft in various positions of angular adjustment by which the table C may be held rigidly in various. positions with respect to the grindin disk, one of such positions being indicatedhy the dotted lines in Fig. 2. For the latter purpose, said hub B is provided with a longitudinal radial slot 6 and opposite each other on the margins of said radial slot are two pairs of outwardly entending lugs 6 Z)". Said lugs are tangentially pierced and adaptedto be engaged by clamping bolts 5 by means of which the split hub B may be peripherally contracted uponthe shaft 0, thereby clamping said hub to said shaft a. The outer portion of the said slot in the hub is occupied by, a strip of soft wood or othe rresilient material 6 which prevents oil from escaping and also prevents dust from entering the hearing. The inner' portion of the slot which is not filled by the wood strip forms an oil groove. When the clamping bolts are tightened the softwood strip is compressed between the margins of the longitudinal slot, permitting the hub to be contracted upon the shaft a, and when the. bolts are loosened and the hub allowed to expand, said strip expands and fills the slot. The hub B is secured against endwise movement on the shaft a by means of two collars a a9, likewise radially slotted or split and peripherally contracted upon the shaft (1 by means of tangential bolts a 1 Upon a vertical s1de face of the hub Bare two parallel vertical flanges b 6 adapted for sliding engagement with the parallel edges if If of the vertical arm 6. Said'arm is provided with a, longitudinal slot 6 through which .pass cap-screws b b, said cap-screws extending into and having screwhrcaded engagement with the hub B and serving to adjustably secure the said arm to said hub B. One of said cap-screws b is extended outwardly to form a handle I) by means of which the hub B and table supported thereby maybe oscillated about the shaft (1. when the hub is loose on the, shaft.

- The work-table C is mounted upon the upper end of said vertical arm 7). Said worktable consists of a horizontal base member C and a tabletop C having horizontally sliding engagement therewith. The base member is pivoted to the upper end of said arm I) so as to swing on an axis parallel with the face of the grinding disk and is thereby adapted to be tilted into positions of varying angularity with respect to the plane of the grinding disk. For this pur pose said base member C is provided with a longitudinally arranged, vertical depending flange 0 provided with a transverse hole a and a curved slot cthaving concentric relation to said hole. The upper end of said vertical, arm 6 is provided with two horizontal holes b b, internally screw-threadted lines in Fig. 1, and can be clamped to the arm in any desired position by tightening said cap-screw 0 Said base-member C is narrower than the table top C and is formed with its side ed es inwardly and downwardly beveled, giving dovetail form thereto. The side margins of the said base member engage the oblique inner faces of two longitudinal flanges 0 con the under surface of said table-top G On the'inner face of one of said flanges is' a thin strip of metal 0 held in place by means of screws engaging internally threaded holes in said flange. By means of'said screws, the strip 0 can be held in contactwith the adjacent beveled edge of the table-top C in order to compensate for wear of the beveled edges of the table-top G On therear end of the table-top C or that remote from the face of the grinding disk, is an arm or extension 0 provided with laterally facing rack-teeth adapted to intermesh with a gear pinion c mounted upon the rear end of the base member G which latter is extended rearwardly beneath the path of said armc"; Said pinion 0 is mounted on and aflixed to the upper end of a vertical shaftO having bearing in the rear end of said base member C To the lower end of said shaft 0*, beneath the base member, is attached a horizontal swinging hand lever C". Said lever C has a hub at one end provided with an opening adapted to receive the lower end of said shaft C? and said hub is radially slotted or split and provided with lugs a" 0 adapted to receive a clamping bolt 0 by means of which said hub may be contracted upon and rigidly secured. to the lower end of said shaft. end of said shaft C which projects below said hub is externally screw-threaded and provided with a nut 0 by means of which said hub may be securely clamped between said nut and a flange or shoulder upon said shaft. By the operation of said lever C the pinionc is rotated and the table-top C is caused to approach or recede from the. face of the grinding disk.

The arm 0 on the table-top C is arranged at one side of the longitudinal center line of said table, and the rack-teeth on the side table is in a The margins of said arm 0 are arranged on said center line, the axis of rotation ofthe pinion o 'being correspondingly located so that the endwise pressure on the table-topdue to the turning of the pinion will be exerted on said center line, and the action of the pinion will therefore have no tendency to shift the table in its bearings in a manner to throw it out of line. At the outer end of said arm a on the table-top is a depending lug c in which is mounted a micrometer screw C arranged in the path of and adapted for contact with the outer end of the base member C Said screw constitutes an adjustable stop for accurately stopping the forward movement of the table-top. C at any predetermined point. For this purpose said micrometer screw is conveniently provided with 'a scale-plate c fixed to said lug 0 Said table-top may also be provided on its upper surface with keywa'ys and grooves 0 having the shape in cross-section of an inverted letter T and adapted to receive the heads of clamps of common form for securing the work to said tabletop.

The work table C and the vertical arm Z) 0n which it is mounted are counterbalanced in such manner that when the hub B is free to rotate upon the shaft a it will automatically assume'a. position with'the arm I; vertical. The means for so counterbalancing the work table comprises a rod or lever B depending obliquely downward from the hub Said arm passes through a weight B adapted to slide lengthwisempon said rod, and held in place by means of a set-screw I). By means of said set-screw, the weight B can be secured on the rod B at such dis-' tance from the shaft -a that its turning moment will balance the turning moment of the 10 other parts of said work-table when said position with its transverse axis horizontal.

In the operation of a grinding machine equipped with a table such as has been above described, the work is ordinarily: held upon the work-table and pressedagainst the grinding disk by the hands of the operator. During the grinding operation, if the hub be left loose on the supporting shaft, the operator may rock the table back and forth, the weight B assisting him to keepsaid table upright, with the result that the work is moved radially over the face of said grinding disk. In cases where it is desired not to rock the work table about its axis a, the bolts I) b may be tightened, thereby securing the table rigidly in position with respect to the grinding disk. In either case the work may beheld upon the table by pressure of the operators hands, or it may be held upon the table by clamps having heads inserted in the grooves 0 here it is desired to grind ofl accurately a predetermined amount of material, the work may be' clamped uponthe table, the micrometer screw properly set, and the table-top C fed toward the face of the grinding disk by means of the rack and pinion device until the inner end of the micrometer screw comes in contact with the outer end of the base member C and stops the horizontal movement of said table to v lhe rack and pinion actuating connection between the table-top and base member has the advantage of giving motion to the tabletop at uniform speed, relatively to the turning movement of the hand lever, in all positions of the "latter, while at the same time it is of simple construction and is durable be cause its wearing parts are not liable to reeeive between. them dustor grit arising from the grinding operation.

I claim as my invention 1. In a grinding machine, the combination with a grinding disk, of a work-table conr prising a base member and a table top ha v ing sliding movement on said base member toward and from the grinding disk, said table-top having a longitudinal, rearwardly extending arm provided with laterally itacing upright rack-teeth arranged on the center longitudinal lme of the table, an upright shaftunounted on the base member at the rear of the table-top, a gear-pinion attached to said shaft above the base memberand intermeshing with said rack-teeth, and a hand-lever attached to the lower end of said shaft for turning the latter and said pinion.

2. In a grindii machine, the combination with a grinding isk. of a -worl table comprising a basen'ielnberanda table-top adapt ed to slide on said base membentoward and from the grinding disk, an upright supporting arm sustaining said base member, said base member consisting of a horizontal plate having an integral, vertical, depending, longitudinal flange and the supporting arm having a flat upper end which is arranged parallel with and in overlapping relation to said flange, a pivot pininserted through said vertical flange and the upper end of the sup porting arm, for 'pivotally connecting said base member withthe supporting arm, said flange bein provided with a slot arranged concentrically with said pivot pin, and a clamping bolt en aging said slot and the supporting arm 5 or securing the. table in positions relatively to the pending flanges engaging the side margins of said base member and wit-h a longitudinally arranged arm vhich .extends rearwardly from the table-top over the rear portion of the said base member, and is provided with laterally facing rack-teeth, a gear pinion located above the base member at the rear 01 the .table-top and intermeshing with the said rack teeth, an upright pinion shaft having bearing in the rear end of the base member, and a horizontally swinging hand lever attached to said shaft beneath the base member for turning said pinion.

4. In a grinding machine, the combination with a grinding disk, of a work-table comprising an elongated base-member and a table-top adapted to slide endwise on the base membertoward and from the face of the grinding disk, said base member being narrower than the table-top and provided bet-ween its side margins with a longitudinal,

lateral flanges extending downwardly over and engaging the side margins of said base member, an upright supporting arm for sustaining the base member. the upper end of which is in overlapping relation to the said flange on the base member. a pivot pin in sorted transversely through said flange on the base member and the su 'iporting arm, for pivotally connecting said parts, and clamping means engaging the said flange and the supporting arm for holding the base member in various angular positions with respect to the supportin arm.

In testimony, that I c laim the foregoing as my invention I afliX my signature in the presence of two witnesses, this 19th day of March A. D. 1907. L

JOHN MILLER, JR; 

